diff --git a/.github/workflows/dotnet.yml b/.github/workflows/dotnet.yml
index 1067d29..bb5249e 100644
--- a/.github/workflows/dotnet.yml
+++ b/.github/workflows/dotnet.yml
@@ -32,7 +32,7 @@ jobs:
       run: |
         $assembly = [System.Reflection.Assembly]::LoadFile("${{ github.workspace }}\Snaffler\bin\Release\Snaffler.exe")
         $version = $assembly.GetName().Version.ToString() + '-' + '${{ github.run_number }}'
-        echo "assemblyVersion=$version" >> $GITHUB_OUTPUT
+        echo "::set-output name=assemblyVersion::$version"
       shell: powershell